Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2007-02-27
2007-02-27
Zemel, Irina S. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S143000, C521S144000, C526S160000, C526S346000, C526S348600, C526S351000, C526S943000
Reexamination Certificate
active
10450603
ABSTRACT:
A process for preparing porous olefin polymers comprising bringing into contact in a polymerization reactor, at a temperature T1, one or more olefins of the formula (I) CH2═CHR1, R1being hydrogen, a C1–C20-alkyl or a C6–C12-aryl group, with a catalyst obtained by reacting a solid catalyst component in the form of spheroidal particles comprising a compound of Ti or V not containing metal-π bonds and a Mg halide, optionally containing one or more electron donor compounds, with an aluminum-alkyl (Al-alkyl) compound, then raising the temperature up to the polymerization temperature, said process being characterized in that: a) if the temperature T1is lower than 40° C., the temperature is raised up to the polymerization temperature is such a way that, for a time of at least one minute after the introduction temperature in such a way that, for a time of at least one minute after the introduction of the catalyst system into the reactor, the temperature of the reaction T2fulfills the following condition of formula (II) wherein m is the time expressed in minutes employed for reaching the temperature T2; or b) if temperature T1is 40° C. or higher, the reactor is maintained for a time of at least one minute at a temperature of at least 40° C.
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Baruzzi Giovanni
Ferraro Angelo
Fusco Ofelia
Stewart Constantine A.
Basell Poliolefine Italia S.p.A.
Raphael Jarrod N
Reid William R
Zemel Irina S.
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